Apparently the angel's guidebook needs to have a chapter about not changing in a hallway
. That and locking doors.
Tsumugi has a tough spot being the normal one and the reliable one. The kind of friend that Shintaro can constantly turn to while having no clue that she's into him. Girl knows that he's setting flags for more girls to join the harem. She's going to need to develop a super power or some over the top personality quirk to keep up! Of course at least being the reliable girl allows her to spend time with him in that sense. Not an immediate opening and might cause her heartache later, but at least she's not ignored.